单幅雷达图像阴影控制点坡度矫正方法仿真

Simulation of the Slope Correction Method for Single-Amplitude Radar Image Shadow Control Point

在雷达成像的过程中,会发生地形重合遮掩等情况,所成图像上的像素点在地形图上对应的部分不存在线性等比关系,同时分辨率不能保持一致,获取坡度采用人工测量方法耗时费力,同时也存在较大的误差。现提出一种单幅雷达图像阴影控制点坡度矫正方法。首先处理前期雷达图像,获得较为平滑的二值图像;然后确定图像特征较明显的像素值在地形图中相应的位置,再依据地形图上相应点距山脊的位置对控制点进行调节;最后选取控制点,迭代矫正优化坡度。经过仿真证明,所提方法对控制点位置和坡度的矫正较为合理,节省时间和物力,同时测量结果准确,可以为相关工作提供很大帮助。

In the process of radar imaging,there is no linear equivalence relationship between the pixels on the image and the corresponding parts of topographic map.The resolution cannot stay the same.It is time-consuming and laborious to use manual measurement method to obtain the slope,and the error is too big.Therefore,a slope correction method for control point in single radar image shadow was proposed.Firstly,the radar image was processed to obtain the smoother binary image,and then the corresponding position of the pixel value with obvious features in topographic map was determined.Moreover,the control point was adjusted by the position of the corresponding point on topographic map from the mountain ridge.Finally,the control point was selected for the iterative correction and the slope optimization.Simulation results show that the proposed method is more reasonable to correct the position and slope of control point,which saves time and material resource.Meanwhile,the measurement results are accurate,which can provide help for the related works.